| Answer | Crossword Clue |
|---|---|
| eohippus | an extinct horse |
| eohippuses | EOHIPPUS, an extinct horse |
| mesohippus | an extinct mammal of the Horse family |
| mesohippuses | MESOHIPPUS, an extinct mammal of the Horse family |
| MRED | Extinct TV horse |
| horse | recent or extinct animal (as a zebra, ass, or onager) of the horse family |
| tarpan | small, dun-colored wild horse chiefly of southern Russia, having a flowing mane and tail: extinct since the early 20th century but somewhat restored by selective breeding of mixed-breed domestic horses, and sustained in zoos |
